}

// removeLeadingRegexp removes the leading regexp in re.
// It returns the replacement for re.
// If reuse is true, it passes the removed regexp (if no longer needed) to p.reuse.
func (p *parser) removeLeadingRegexp(re *Regexp, reuse bool) *Regexp {
	if re.Op == OpConcat && len(re.Sub) > 0 {
		if reuse {
			p.reuse(re.Sub[0])
		}
		re.Sub = re.Sub[:copy(re.Sub, re.Sub[1:])]
		switch len(re.Sub) {
		case 0:

include::sample[dir="snippets/configurationCache/problemsFixedReuse/groovy",files="build.gradle[tags=fixed-reuse]"]
====
<1> We wired the system property provider directly, without reading it at configuration time.

With this simple change in place we can run the task any number of times, change the system property value, and reuse the configuration cache:

----

# Internal targets below this point.

cc_library(
    name = "variable_info",
    srcs = ["variable_info.cc"],
    hdrs = ["variable_info.h"],
    visibility = [
        ":internal",
        # We reuse VariableInfo in TFRT's implementation of TpuExecuteOp.
        "//learning/brain/tfrt/tf_tpu:__pkg__",
        "//learning/brain/tfrt/tpu_plugin:__pkg__",
        "//learning/brain/tfrt/tpu_common:__pkg__",

 *  Fix: Don't release HTTP/2 connections that have multiple canceled calls. We had a bug where
    canceling calls would cause the shared HTTP/2 connection to be unnecessarily released. This
    harmed connection reuse.
 *  Fix: Ensure canceled and discarded HTTP/2 data is not permanently counted against the limited
    flow control window. We had a few bugs where window size accounting was broken when streams
    were canceled or reset.

    assertThat(response3.body.string()).isEqualTo("GHI")
    // Settings connection.
    assertThat(server.takeRequest().sequenceNumber).isEqualTo(0)
    // Reuse settings connection.
    assertThat(server.takeRequest().sequenceNumber).isEqualTo(1)
    // Reuse settings connection.
    assertThat(server.takeRequest().sequenceNumber).isEqualTo(2)
    // New connection!

	}

	// Ensure that timer is stopped.
	if !cacher.timer.Stop() {
		// Consume triggered (but not yet received) timer event
		// so that future reuse does not get a spurious timeout.
		<-cacher.timer.C
	}
	var contextMetadata metadata.MD
	if utilfeature.DefaultFeatureGate.Enabled(features.SeparateCacheWatchRPC) {

	recorder       events.EventRecorder

	serviceHealthServer healthcheck.ServiceHealthServer
	healthzServer       *healthcheck.ProxierHealthServer

	ipvsScheduler string
	// The following buffers are used to reuse memory and avoid allocations
	// that are significantly impacting performance.
	iptablesData     *bytes.Buffer
	filterChainsData *bytes.Buffer
	natChains        proxyutil.LineBuffer
	filterChains     proxyutil.LineBuffer

	// 1. the thread might be a Go thread,
	// 2. or it wasn't the first call from a C thread on pthread platforms,
	//    since then we skip dropm to reuse the m in the first call.
	MOVQ	savedm-8(SP), BX
	CMPQ	BX, $0
	JNE	done

	// Skip dropm to reuse it in the next call, when a pthread key has been created.
	MOVQ	_cgo_pthread_key_created(SB), AX

	// and we are using only probabilities in the format of 1/n, we are
	// precomputing some number of those and cache for future reuse.
	precomputedProbabilities []string

	// The following buffers are used to reuse memory and avoid allocations
	// that are significantly impacting performance.
	iptablesData             *bytes.Buffer
	existingFilterChainsData *bytes.Buffer

		// sched.idleTime and sched.totaltime. memstats also include
		// the pause time (work,pauseNS), forcing computation of the
		// total pause time before the pause actually ends.
		//
		// Here we reuse the same now for start the world so that the
		// time added to /sched/pauses/total/gc:seconds will be
		// consistent with the value in memstats.
		startTheWorldWithSema(now, stw)
	})